Attic Fan Power Consumption

As you can see the consumption correlates to the wattage of the appliance.

Attic fan power consumption.

Attic power ventilators energy consumption while the specifics will change with each home the general consensus is that attic power fans actually use more energy than they save. Temp 92 f at 5pm. When set at low speed fans use between 15 and 30 watts and at high speed they consume between 50 and 100 watts. However if your attic has blocked soffit vents and is not well sealed from the rest of the house attic fans will suck cool conditioned air up out of the house and into the attic.

A more helpful comparison may be to an air conditioning unit. After attic fan installation ac still off during day. Energy usage of about 40 watts at medium speed is typical. Sources such as the billings gazette energy vanguard and home power all have articles that essentially say the same thing.

Temp 84f at 5pm. Not many appliances in the home consume as little power as a fan. During workdays would leave air conditioner off when leaving in the morning. This was observed on numerous days following the installation.

The net free area of a vent takes into account the resistance offered by its louvers and insect screens. Attic power ventilators are simply not. The electricity consumption of a ceiling fan ranges widely depending on the design and the speed setting of the fan. You could run 30 fans using 50 watts for the same power consumption.

The attic fan kept my house cooler by 8f compared to pre fan installation days. Attic fan ventilation attic fans are intended to cool hot attics by drawing in cooler outside air from attic vents soffit and gable and pushing hot air to the outside.